EnhancingHigh-TemperatureStrengthandThermalStabilityofAl2O3/AlCompositesbyHigh-TemperaturePre-treatmentofUltrafineAlPowders

被引：1

作者：

YuNing Zan ^{[1
,2
]}

YangTao Zhou ^{[1
]}

XiaoNan Li ^{[1
,2
]}

GuoNan Ma ^{[1
,2
]}

ZhenYu Liu ^{[1
]}

QuanZhao Wang ^{[3
]}

Dong Wang ^{[1
]}

BoLv Xiao ^{[1
]}

ZongYi Ma ^{[1
]}

机构：

[1] Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences

[2] School of Materials Science and Engineering,University of Science and Technology of China

[3] Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences

来源：

ActaMetallurgicaSinica(EnglishLetters) | 2020年 / 33卷 / 07期

关键词：

Aluminum matrix composites; Particles; High-temperature strength; Thermal stability;

D O I：

暂无

中图分类号：

TB333 [金属－非金属复合材料];

学科分类号：

0805 ; 080502 ;

摘要：

Amorphous Al2 O3-reinforced Al composite（am-Al2 O3/Al） compacted from ultrafine Al powders for high-temperature usages confronts with drawbacks because crystallization of am-Al2 O3 at high temperatures will result in serious strength loss.Aiming at this unsolved problem,in this study,high-temperature Al materials with enhanced thermal stability were developed through introducing more thermally stable nano-sized particles via high-temperature pre-treatment of ultrafine A1 powders.It was found that the pre-treatment at ≤550℃ could introduce a few Al2 O3 in the Al matrix and increase the strength of the composites,but the strength was still below that of am-Al2 O3/Al because without being pinned firmly,grain boundaries（GBs） were softened at high temperature and intergranular fracture happened.When the pre-treatment was carried out at 600℃,nitridation and oxidation processes happened simultaneously,producing large numbers of intergranular（AlN+γ-Al2 O3） particles.GB sliding and intergranular fracture were suppressed;therefore,higher strength than that of am-Al2 O3/Al was realized.Furthermore,the（AIN+γ-Al2 O3）/Al exhibited more superior thermal stability compared to amAl2 O3/Al for annealing treatment at 580℃ for 8 h.Therefore,an effective way to fabricate high-temperature Al composite with enhanced thermal stability was developed in this study.

引用

页码：913 / 921

页数：9